linux-kernel - [PATCH] PCI: apple: do not leak reset GPIO on unbind/unload/error

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Message-ID: <YxatO5OaI2RpxQ2M@google.com>
Date:   Mon, 5 Sep 2022 19:15:23 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Marc Zyngier <maz@...nel.org>
Cc:     Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] PCI: apple: do not leak reset GPIO on unbind/unload/error

The driver allocates reset GPIO in apple_pcie_setup_port() but neither
releases the resource, nor uses devm API to have it released
automatically.

Let's fix this by switching to devm API. While at it let's use generic
devm_fwnode_gpiod_get() instead of OF-specific gpiod_get_from_of_node()
- this will allow us top stop exporting the latter down the road.

Fixes: 1e33888fbe44 ("PCI: apple: Add initial hardware bring-up")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---

This patch has been pulled out of the series
https://lore.kernel.org/all/20220903-gpiod_get_from_of_node-remove-v1-0-b29adfb27a6c@gmail.com/
with updated justification (leak fix vs pure API deprecation).

 drivers/pci/controller/pcie-apple.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
index a2c3c207a04b..66f37e403a09 100644
--- a/drivers/pci/controller/pcie-apple.c
+++ b/drivers/pci/controller/pcie-apple.c
@@ -516,8 +516,8 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie,
 	u32 stat, idx;
 	int ret, i;
 
-	reset = gpiod_get_from_of_node(np, "reset-gpios", 0,
-				       GPIOD_OUT_LOW, "PERST#");
+	reset = devm_fwnode_gpiod_get(pcie->dev, of_fwnode_handle(np), "reset",
+				      GPIOD_OUT_LOW, "PERST#");
 	if (IS_ERR(reset))
 		return PTR_ERR(reset);
 
-- 
2.37.2.789.g6183377224-goog


-- 
Dmitry